What evidence do you have that immortal superbeings would be bisexual? I mean, I'd be willing to bet quite a bit on the proposition that immortal superbeings would have few if any consistent species-wide sexual preferences, since the role of sexuality in promoting reproduction would no longer be relevant at that point, due to inescapably logical demographic consequences of 'immortality' and the prophylactic options implied by the term 'superbeings.'

In short, please unpack this "immortal bisexual superbeing" concept a bit more, so we can all figure out where you went wrong.